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Title: Missing pulse detector for a variable frequency source

Abstract

A missing pulse detector is provided which has the capability of monitoring a varying frequency pulse source to detect the loss of a single pulse or total loss of signal from the source. A frequency-to-current converter is used to program the output pulse width of a variable period retriggerable one-shot to maintain a pulse width slightly longer than one-half the present monitored pulse period. The retriggerable one-shot is triggered at twice the input pulse rate by employing a frequency doubler circuit connected between the one-shot input and the variable frequency source being monitored. The one-shot remains in the triggered or unstable state under normal conditions even though the source period is varying. A loss of an input pulse or single period of a fluctuating signal input will cause the one-shot to revert to its stable state, changing the output signal level to indicate a missing pulse or signal.

Inventors:
 [1];  [2]
  1. (Harriman, TN)
  2. (Concord, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863299
Patent Number(s):
4142159
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
missing; pulse; detector; variable; frequency; source; provided; capability; monitoring; varying; detect; loss; single; total; signal; frequency-to-current; converter; output; width; period; retriggerable; one-shot; maintain; slightly; one-half; monitored; triggered; twice; input; rate; employing; doubler; circuit; connected; remains; unstable; normal; conditions; fluctuating; revert; stable; changing; level; indicate; signal level; signal input; pulse detector; circuit connected; variable frequency; output pulse; pulse width; output signal; input pulse; frequency source; single pulse; pulse rate; pulse source; missing pulse; normal conditions; pulse period; normal condition; varying frequency; frequency pulse; /327/

Citation Formats

Ingram, Charles B., and Lawhorn, John H. Missing pulse detector for a variable frequency source. United States: N. p., 1979. Web.
Ingram, Charles B., & Lawhorn, John H. Missing pulse detector for a variable frequency source. United States.
Ingram, Charles B., and Lawhorn, John H. Mon . "Missing pulse detector for a variable frequency source". United States. https://www.osti.gov/servlets/purl/863299.
@article{osti_863299,
title = {Missing pulse detector for a variable frequency source},
author = {Ingram, Charles B. and Lawhorn, John H.},
abstractNote = {A missing pulse detector is provided which has the capability of monitoring a varying frequency pulse source to detect the loss of a single pulse or total loss of signal from the source. A frequency-to-current converter is used to program the output pulse width of a variable period retriggerable one-shot to maintain a pulse width slightly longer than one-half the present monitored pulse period. The retriggerable one-shot is triggered at twice the input pulse rate by employing a frequency doubler circuit connected between the one-shot input and the variable frequency source being monitored. The one-shot remains in the triggered or unstable state under normal conditions even though the source period is varying. A loss of an input pulse or single period of a fluctuating signal input will cause the one-shot to revert to its stable state, changing the output signal level to indicate a missing pulse or signal.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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